--- a/hgext/configwizard/__init__.py
+++ b/hgext/configwizard/__init__.py
@@ -240,16 +240,17 @@ command = cmdutil.command(cmdtable)
 
 wizardsteps = {
     'hgversion',
     'username',
     'diff',
     'color',
     'historyediting',
     'fsmonitor',
+    'blackbox',
     'wip',
     'security',
     'firefoxtree',
     'codereview',
     'pushtotry',
     'multiplevct',
     'configchange',
     'permissions',
@@ -290,16 +291,21 @@ def configwizard(ui, repo, statedir=None
         _promptnativeextension(ui, cw, 'color', 'Enable color output to your terminal')
 
     if 'historyediting' in runsteps:
         _checkhistoryediting(ui, cw)
 
     if 'fsmonitor' in runsteps:
         _checkfsmonitor(ui, cw, hgversion)
 
+    if 'blackbox' in runsteps:
+        _promptnativeextension(ui, cw, 'blackbox',
+                               'Enable logging of commands to help diagnose bugs '
+                               'and performance problems')
+
     if 'wip' in runsteps:
         _checkwip(ui, cw)
 
     if 'security' in runsteps:
         _checksecurity(ui, cw, hgversion)
 
     if 'firefoxtree' in runsteps:
         _promptvctextension(ui, cw, 'firefoxtree', FIREFOXTREE_INFO)

new file mode 100644
--- /dev/null
+++ b/hgext/configwizard/tests/test-blackbox.t
@@ -0,0 +1,52 @@
+  $ . $TESTDIR/hgext/configwizard/tests/helpers.sh
+
+Rejecting blackbox doesn't enable it
+
+  $ hg --config ui.interactive=true --config configwizard.steps=blackbox,configchange configwizard << EOF
+  > 
+  > n
+  > EOF
+  This wizard will guide you through configuring Mercurial for an optimal
+  experience contributing to Mozilla projects.
+  
+  The wizard makes no changes without your permission.
+  
+  To begin, press the enter/return key.
+   <RETURN>
+  Enable logging of commands to help diagnose bugs and performance problems (Yn)  n
+
+No prompt if blackbox already enabled
+
+  $ hg --config configwizard.steps=blackbox --config extensions.blackbox= configwizard
+  This wizard will guide you through configuring Mercurial for an optimal
+  experience contributing to Mozilla projects.
+  
+  The wizard makes no changes without your permission.
+  
+  To begin, press the enter/return key.
+   <RETURN>
+
+blackbox extension enabled if no input
+
+  $ hg --config configwizard.steps=blackbox,configchange configwizard
+  This wizard will guide you through configuring Mercurial for an optimal
+  experience contributing to Mozilla projects.
+  
+  The wizard makes no changes without your permission.
+  
+  To begin, press the enter/return key.
+   <RETURN>
+  Enable logging of commands to help diagnose bugs and performance problems (Yn)  y
+  Your config file needs updating.
+  Would you like to see a diff of the changes first (Yn)?  y
+  --- hgrc.old
+  +++ hgrc.new
+  @@ -0,0 +1,2 @@
+  +[extensions]
+  +blackbox =
+  
+  Write changes to hgrc file (Yn)?  y
+
+  $ cat .hgrc
+  [extensions]
+  blackbox =